Question about Mitsubishi VS-45607 45" Rear Projection Television

3 Answers

Can't control red convergence on VS-45607

I can't adjust the red convergence vertically or horizontally.

Both the blue and green convergence are still fine.

Sometimes, after unplugging the TV for like a week or more, I will get the ability to adjust the red convergence. But, then, after a few hours of watching TV, the red convergence fails and I can no longer adjust it.

I have read other posts about replacing the two STKs.

However, I actually bought the service repair manual (a while back), and looking at the schematics, it seems like the horizontal and vertical red signal are always being processed separately. Seems odd that the ICs would fail just for a single color.

So I'm wondering if the problem lies elsewhere - bad capacitor - or deflector circuitry.

Posted by on

  • ramoas Aug 03, 2008

    Slinteriors - unless the schematic is wrong, it seems to be quite clear.



    STK#1 (IC8C01) controls horizontal for blue, green, and red.



    STK#2 (IC8C02) controls vertical for blue, green, and red.



    Each STK is NOT controlling both H + V of one color plus H or V of green.



    Thus, if red convergence control is completely lost because of failed ICs, that means both ICs would have to be defective for red. If the failure of each channel in each IC is independent, then that gives me ~10% proability (1/3 * 1/3). Not negligible, but low enough to make me skeptical.



    I'm just trying to avoid replacing something that might not actually be the problem. I'll probably still end up replacing the STKs, but I'm really not convinced that both of my ICs are bad.

×

3 Answers

Shoot your tv

Posted on Aug 07, 2008

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  • Master
  • 927 Answers

Good Day, ramoas;

If the convergence works when TV is cold and fails as it warms up you may only have poor solder connections on the STK's, but given the age of the unit you should just go ahead a replace the $30.00 worth of IC's.

Good luck, big IRISH.

Posted on Aug 06, 2008

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  • Mitsubishi Master
  • 8,617 Answers

The STKs are three channel ICs they each control horizontal and vertical of one color the third channel controls part of green and the other half of green is controled by the other ICs third channel. Its customary for the Ics to fail and only have one channel bad in the IC. However its recomended to change both because of the bad Ic having green it can actually weaken the other IC and that one will fail shortly.

Posted on Aug 03, 2008

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    1. Enter the menu on your TV. Use the remote control and bring up the menu.
    2. Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."
    3. Select a color. You will have red, green and blue to choose from. Do each one, starting with red.
    4. Press "Enter." A crosshair pattern will appear on your screen.
    5. Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.
    6. Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.
    7. Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.
    8. Repeat these steps for all colors.

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  • Look through your manual. Your manual will always give you the most specific directions for your particular model. Look for an "adjusting convergence" or "set manual convergence" section.

  • Enter the menu on your TV. Use the remote control and bring up the menu.
  • Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."
  • Select a color. You will have red, green and blue to choose from. Do each one, starting with red.
  • Press "Enter." A crosshair pattern will appear on your screen.
  • Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.
  • Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.
  • Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.
  • Repeat these steps for all colors.

  • good luck!

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